Philamdee bexfobd



P. RBXFORD.

PIRE G'RATB.

" Patented 411g. 14, 188s.

3&9; Mv if@ n. PETERS. Pw.. mnngnph". waqhmgncn, v. c

i VlUNrT-En STATES lATnNT OFFICE.;

Fmi-GRATE.

AsrEcarreArron `forming.; part of Letters Patent No; 2e3 ,144, dated August 14, 1883; Application filed May 21,1883. `(Model.) r r l Be it known that I, -PnrLANDER REXFoRn,

" of Syracuse, in the county of Onondaga, in the'l i and exact description.

i construction and combination4 of gratebars ipivoted intermediately` of t their depth, `and having proj ectingfrom the upper part of `one and the same side a series of teeth or ribs. `Said bars,` when in their normalposition, stand obliquely, and form` with their upper lpor-I tions a succession of troughs, one side of `which .poses sa'id solid side of the trough formsH an inclined chute under the ribbed side of the adi,`

n ingress of air to the re.

` for the same, all as hereinafter more fully. de-

is solid and plain, and serves. to prevent too free escape of the lower stratum of the bed of iire, and-thus adapts the grate for theuse of ne coal, and while serving the aforesaid purjacent grate-bar, the latter affordingusufticient Said grate, when shaken, causes the top of the several bars to rise and break up the bed of iire and'scrape and stir the bottom stratum thereof, and at the same time saidbarsV turn into`a vertical position, and thereby enlarge the egress for the ashes and cinders and afford a freer escape scribed, and set forth` inthe claims. In the annexed drawings, Figure 1 is a vertical longitudinal section of my improvedlfire grate when in its normal position. Fig. 2 is the same view, showing the position into which the grate-bars are thrownlwhen shaken. Fig, 3 is a plan view of the grate, and Fig. 4 is an isometric detached view of one of the gratebars. i

Similar letters of reference indicate corre-` sponding parts. t A denotes the grate-supporting frame, having its two sides provided with suitable bear.`

ings, b b, for the grate-bars C G, which latter are provided at or near the center of their ends with trunnions c c, by which they are pivoted in the bearings b b aforesaid. t

The several grate-bars are provided on one and th e same side with teeth or ribs a, extending from the top edge of the bar part way downward, with gradually-eliminishing proj c ction. The opposite side or back of the bar is plain and preferably beveled toward the top and bottom of the bar.` in their normal position, stand obliquely, each resting withnthe top of `its teeth or ribs a c `on the plain back of the adjacent bar, asillus-i trated in Fig. l of the drawings.` It will be observed that this forms a succession of V- 4shaped troughs, one side of which is plain and solid, and the other side has` perforations or ports formed by the -interstices between the ribs a a. The solid side ofsaid troughs, while forming an inclined chute toward the perfo-` rated side of theA trough and under the ribs a a., at the same time presentsa broad bearing- These grate-bars,when

surface for the bottom stratum of the bed of f iire, and 'thus prevents too rapid escape from saidstratum, and admits of the use of `fine y anthracite coal as fuel, the perforated side of the trough affording sufficient ingress 'of air to the fire to `supply the s ame with the requisiteoxygen.

To `the bottom of the several grate-bars is hinged a bar` cl, extended the length ofthe grate and connected with a lever, l, by which to impart a reciprocating motion to the bar d,

which transmits an oscillating motion to the grate-bars. In the oscillation ofthe grate-bars fthe alternate inclined solid backs and toothed tops `presented by the bars tend to raise to some extent the bed of the fire, and thus stir and open it, to allow the ashes and clinkers to fall to the bottom and the air to freely permeate through the fire. As the bars attain a vertical position the egress for the ashes and cinders is enlarged Vand the escape of the same faeilitated, and the further movement of the bars causes the toothed top thereof to scrape the `bottom stratum of the bed of iire. At the same time the bars fall into an oblique position, as

(shown in Fig. 2 of thezdrawings, `and thereby partlycontractthe openings between them,

so as to prevent excessive escape of the loos- IOO the bars, andthe iire is left clean,bright, and

loose, to admit 'of a free circulation of air through` it. l

By beveling the plain back of the bar toward the top and bottom thereof the upper portion of said back is caused to present a flatter sur- -face, and the lower portion produces a downward iiare in the space between the bars, the former increasing the capacity for supporting the fire, and the latter serving to keep clear the spaces between the bars.

I am aware that oscillating grate-bars have been constructed with lugs or teeth upon opposite sides thereof; but it is obvious that such bars d o not, when .in their normal position,form a succession of troughs one side of which is plain and solid and forms a partial support for the re, and a smooth inclined plane eX- tending the entire depth of the bar to allow the aforesaid improved result it will vbe observed that my improved grate-bar is of such a form as to greatly facilitate the molding and casting thereof.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, 1s-

1. The combination lof grate-bars pivoted intermediately of their depth and having projecting from the upper part, on one' and the same side, a series of teeth or ribs, substantially as set forth. A

2. Av grate-bar pivoted intermediately of its Adepth and having one side plain and provided on the upper part of its opposite side with a series of teeth or projections, in combination with a similarly constructed and pivoted bar disposed with its plain side adjacent to the toothed side of the first-described bar, substantially as shown and set forth.

3. A gratel composed of grate-bars pivoted at about ,midway their depth, and having on one and the same side vertical ribs extending from the top of the bar part way the depth ofthe same, with gradually-reduced projection, substantially as shown.

4. A grate-bar pivoted intermediately of its depth and having one of its sides plain and the opposite side provided with vertical ribs extending'from the top edge of the bar part way the depth thereof, with gradually-di `minishing projection, in combination with a similarly constructed and pivoted bar standing with its plain side facing the ribs of the first-described bar, substantially as shown and 6o described.

5. A grate-bar pivoted intermediately of its depth and provided atf the upper portion of one side with teeth or projections and having the opposite sideplain, with the upper portion 65 thereof beveled toward the top of the bar, Vsubstantially as described and shown.

6. A grate-bar pivoted intermediately of its depth and havingy one side provided with teeth Lor projections at its upper portion and 7o the opposite side plain and beveled towardthe top and bottom of the bar, substantially as described and shown.

In testimony whereof I have hereunto signed my name and affixed myseal, in the presence 75 of two attesting witnesses, at Syracuse, in the county of Onondaga and State of New York, this 20th day of February, 1883.

PHILANDER REXFORD. [L s.]

Witnesses:

.0. H. DUELL, C. BENDIXON. 

